Results 31 to 40 of about 1,868 (166)
Stellar Atmospheric Parameters for Cool Dwarfs in Gaia Data Release 3
The Astrophysical Journal Supplement SeriesWe provide a catalog of atmospheric parameters for 1,806,921 cool dwarfs from Gaia Data Release 3 (DR3) that lie within the range covered by LAMOST cool dwarf spectroscopic parameters: 3200 K < T _eff < 4300 K, −0.8 < [M/H] < 0.2 dex, and 4.5 < log g < 5.
Cai-Xia Qu +6 more
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The Orbital Eccentricity–Radius Relation for Planets Orbiting M Dwarfs
The Astronomical JournalThe orbital eccentricity–radius relation for small planets is indicative of the predominant dynamical sculpting processes during late-stage orbital evolution. Previous studies have shown that planets orbiting Sun-like stars exhibit an eccentricity–radius
Sheila Sagear +4 more
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Stellar Cycle and Evolution of Polar Spots in an M+WD Binary
The Astrophysical JournalStellar activity cycles reveal continuous relaxation and induction of magnetic fields. The activity cycle is typically traced through the observation of cyclic variations in total brightness or Ca H&K emission flux of stars, as well as cyclic variations ...
Xinlin Zhao +7 more
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No Evidence for More Earth-sized Planets in the Habitable Zone of Kepler's M versus FGK Stars
The Astronomical Journal, 2023 Reliable detections of Earth-sized planets in the habitable zone remain elusive in the Kepler sample, even for M dwarfs. The Kepler sample was once thought to contain a considerable number of M-dwarf stars ( T _eff < 4000 K), which hosted enough Earth ...
Galen J. Bergsten +5 more
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CARBON-TO-OXYGEN RATIOS IN M DWARFS AND SOLAR-TYPE STARS [PDF]
The Astrophysical Journal, 2016 ABSTRACT It has been suggested that high C/O ratios (>0.8) in circumstellar disks lead to the formation of carbon-dominated planets. Based on the expectation that elemental abundances in the stellar photospheres give the initial abundances in the circumstellar disks, the frequency distributions of C/O ratios of solar-type stars have ...
Tadashi Nakajima, Satoko Sorahana
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The Astrophysical JournalInterpretation of data from faint dwarf galaxies is made challenging by observations limited to only the brightest stars. We present a major improvement to tackle this challenge by undertaking zoomed cosmological simulations that resolve the evolution of
Eric P. Andersson +6 more
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Precise Mass, Orbital Motion, and Stellar Properties of the M-dwarf Binary LP 349−25AB
The Astrophysical JournalLP 349−25 is a well-studied close stellar binary system comprised of two late M dwarf stars, where both stars are close to the limit between star and brown dwarf. This system was previously identified as a source of gigahertz radio emission.
Salvador Curiel +3 more
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Reconciliation of M Dwarf and FGK Stellar Abundances with Galactic Chemical Evolution
The Astrophysical JournalPrevious studies report apparent chemical abundance discrepancies between M dwarfs and FGK stars in the solar neighborhood, raising questions about the origin of these differences. Using a statistical pipeline, we revisit whether M dwarf abundance ratios
T. C. L. Trueman +5 more
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Shock formation around planets orbiting M‐dwarf stars [PDF]
Astronomische Nachrichten, 2011 AbstractBow shocks can be formed around planets due to their interaction with the coronal medium of the host stars. The net velocity of the particles impacting on the planet determines the orientation of the shock. At the Earth's orbit, the (mainly radial) solar wind is primarily responsible for the formation of a shock facing towards the Sun. However,
Vidotto, A. A. +4 more
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In the Quest for Pulsation in Main-sequence M Dwarf Stars from TESS Observations
The Astrophysical JournalWe report the results of an extensive survey in the quest for pulsation signatures in main-sequence M dwarf stars, based on observations acquired by the TESS space mission.
R. G. S. B. De Amorim +5 more
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